Foam got here a couple days ago. Cut it to fit the area yesterday while I was bored at work. Just used scissors...worked fine. Got to working on the rest of it this morning. Used 1/2” as the base, and 1” as the storage. My underseat isn’t as tall as I thought, so I’m glad I went thinner. Didn’t remember to take many pics as I went, but the end result should be enough.
Here was the first attempt. Plan was to overlap two mags using this design.
But the seat wouldn’t close down with two mags. There’s a lip that end of the foam is sitting on. (I ended up only cutting about a 1” strip the length of the 12x36 piece for it to fit, so I glued it underneath the base piece as a support going up to the lip). So I went back to Plan B.
Found a spot in the back of the foam to add another mag standing on its side, since it’s actually behind the seat when it’s closed. Cut the end off the piece I cut out for mags and glued it back in place. Ended up with this:
It’s always easier when you have good help.
Another pic in sun with loaded mags.
Everything fits and the seat lowers.
I used a hot glue gun to attach the two pieces. Seemed to work fine. I did end up using a razor blade to cut out the additional mag spot since I’d already glue the halves together.
Overall, I’m satisfied. That’s 151 rounds of 40gr V-Max, suppressed. I did find I had a 20rd pmag here and it’s about the length of the grip, so it worked well. The ammo is fed from the top, and the brass shoots out the factory magwell. I removed the base, spring and follower, and had to cut the top portion of the mag that extends past the top of the lower receiver. The 20 rounder just gives me another grip point and provides a better chute for the brass to fly out of.